Star drill



L. A. SMITH STAR DRILL Jan. 5, 1937. f

Filed Deo. 9, 1955 Patented Jan. 5, 1937 UNITED i STATES STAR DRILL Lloyd A. Smith, Portland, Oreg., assigner, by

direct and mesne assignments, to Diamond Expansion Bolt Company, Inc., Garwood, N. J., a corporation of New Jersey Application December 9, 1935, Serial No. 53,536

3 Claims.

This invention relates generally to drills, and particularly to a star drill and especially to a means forV operating same.

The main object of this invention is the construction of an improved form of driver for star drills to permit the operator to easily and accurately drill a hole in brick, concrete, stone or similar materials.

The second object is to render unnecessary the use of a hammer in driving star drills and to facilitate the driving of same in inaccessible places and places remote from the operator.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which:

Fig. 1, showing the driver in readiness for striking, is a side elevation showing the drill and my improved operating means.

Fig. 2 is a longitudinal section showing the driver in a striking position.

Fig. 3 is a plan of Fig. 2.

Fig. 4 is a section taken along the line 4-4 in Fig. 2.

Fig. 5 is a section taken along the line 5-5 in Fig. 2. Y

Fig. 6 is ra section taken along the line 6 6 in Fig. 2. Y

Fig. 7 is an end View of a star drill point.

Fig. 8 is a side elevation of an extension for the drill.

Similar numbers of reference refer to similar parts throughout the several views.

Referring in detail to thedrawing, there -is shown a common form of star drill I0, whose tapered shank II is held within a holder I2 which is provided with a slot I3 for the reception of a wedge for the removal of the drill. On the holder I2 is placed a rubber hand grip I4, which is preferably cemented to the holder I2. Extending from the holder I2 is a guide rod I5 upon which is slidably mounted the driving head I 6 whose end I'I engages the flange I 8, which is formed between the holder I2 and the rod I5 and is integral therewith. The rod I5, however, is free to rotate within the end I'I. The driving head I6 has an enlarged bore I9 and the cross pins 20 extend through the rod I5 and guide within the bore I9. If desired, the end 2| of the rod I5 may contact the end 22 of the driving head I6 instead of having a striking action directed against the flange I8, which in that case can be omitted entirely.

In Fig. 8 is shown an extension 23 having a tapering end 24 which fits within the holder I2 (Cl. Z55-42) and the socket 25 which receives the tapered shank II of the drill I0 itself or the corresponding tapering end 24 of a second extension.

In'the operation of the device it will only be necessary to insert the desired drill I0 within the holder I2 and hold the entire device at the desired angle with relation to the structure 25, then while rotating the hand grip I4 with one hand to impart a sliding striking action with the other hand which grasps the driving head I6. It can be seen from the foregoing that not only can both hands be used to hold the drill in the proper alinement, but the operator can devote his entire attention to the drilling operation instead of concerning himself with his own safety as is necessarily the case when a hammer is employed.

InV some cases it may be found desirable to insert the drill I0 through -a ratchet wrench in order to provide a "greater leverage for the turning action. In any event it is desirable to provide flattened sides on the flange I8 to expedite the turning of a drill in event it becomes lodged in the hole being formed in the structure 26.

In order to insert the cross pins 20 in the rod I5, there is provided the hole 2'I in the driving head I6.

I claim:

1. In a device of the class described, the combination of an elongated guide rod having a flange formed around same between its ends, the portion of said rod on one side of said flange constituting a guide and the portion of said rod on theV opposite side of said flange constituting a holder having a recess formed thereon for the reception of a drill, a tubular driving head slidably mounted on the guide portion, said head having a counterbored recess formed therein, said guide having cross pins projecting therefrom and said head having a pin inserting hole formed in the side thereof communicating with said counterbored portion, the end of said driving head nearest said flange being adapted to engage said flange for the purpose of imparting a striking blow thereto.

2. The device described in claim 1 characterized by having a rubber grip mounted on the holder portion of said device, said grip having encircling angesY formed around the ends thereof.

3. A ldevice of the class described consisting of an elongated rod of circular cross section having a flange formed around same integral therewith intermediate its ends, one end of said rod having a tapering recess therein adapted to rerodand the interior of said head for the full length thereof except near its striking Yend and a pair of pins projecting` from the end of said rod farthest from said `flange into the clearance n space formed by said counterbored, said projecting pins serving to prevent the removal ofV saidY head from said rod.

LLOYD A. SMITH. 

